Option A is not correct as we usually are taking Mesopotamia as cradle of civilization.
Option B is correct as China, which is a part of this region is the world's most populous country. Of course, there are also some other populous countries, such as Japan.
Option C is not correct as in general regions of Eastern Hemisphere, outside Australia are not that rich.
Option D is not correct as Equator doesn't pass through East Asia.
The Jim Crow laws were a legal system of racism and discrimination. They had a very negative affect on African Americans, "white schools" were typically better than schools for African Americans. "Jobs for African Americans" also paid less than "jobs for white people". If I had been subject to this discrimination I would feel angry and abused.
